EP1600628B1 - Injecteur de carburant avec un disque à orifices ainsi que la méthode de formation du disque à orifices - Google Patents

Injecteur de carburant avec un disque à orifices ainsi que la méthode de formation du disque à orifices Download PDF

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Publication number
EP1600628B1
EP1600628B1 EP05010013A EP05010013A EP1600628B1 EP 1600628 B1 EP1600628 B1 EP 1600628B1 EP 05010013 A EP05010013 A EP 05010013A EP 05010013 A EP05010013 A EP 05010013A EP 1600628 B1 EP1600628 B1 EP 1600628B1
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EP
European Patent Office
Prior art keywords
orifice
fuel injector
perimeter
wall
wall portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05010013A
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German (de)
English (en)
Other versions
EP1600628A1 (fr
Inventor
Michael J. Joseph
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive Systems Inc
Original Assignee
Continental Automotive Systems US Inc
Continental Automotive Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Systems US Inc, Continental Automotive Systems Inc filed Critical Continental Automotive Systems US Inc
Publication of EP1600628A1 publication Critical patent/EP1600628A1/fr
Application granted granted Critical
Publication of EP1600628B1 publication Critical patent/EP1600628B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • This invention relates generally to electrically operated fuel injectors of the type that inject volatile liquid fuel into an automotive vehicle internal combustion engine, and in particular the invention relates to a novel thin disc orifice member for such a fuel injector and a method of forming an oblique spiral fuel flow.
  • Contemporary fuel injectors must be designed to accommodate a particular engine.
  • the ability to meet stringent tailpipe emission standards for mass-produced automotive vehicles is at least in part attributable to the ability to assure consistency in both shaping and aiming the injection spray or stream, e.g., toward intake valve(s) or into a combustion cylinder. Wall wetting should be avoided.
  • DE19906146 describes a nozzle with a screw profile in the wall of the flow channel which is arranged to have a sufficient ratio of thread depth to hydraulic diameter to allow individual jets to be produced from the nozzle.
  • a fuel injector for metering, atomizing and spray targeting of fuel comprises a seat including a passage extending along a longitudinal axis; a movable member cooperating with the seat to permit and prevent a flow of fuel through the passage; and an orifice disc including a member including first and second generally parallel surfaces, the first surface generally confronting the seat, and the second surface facing opposite the first surface; and an asymmetric orifice extending through the member between first and second generally planar surfaces of the member along an orifice axis and being defined by a wall coupling the first and second surfaces, the wall including a first wall portion spaced from the first surface, the first wall portion extending substantially perpendicular to the first and second generally planar surfaces and about the longitudinal axis to define an elliptical transition perimeter; and a second wall portion coupling the first wall portion to the first surface to define an elliptical inlet perimeter on the first surface, the second wall portion including a plurality of segmented
  • the present invention provides a fuel injector for spray targeting fuel as defined in claim 1.
  • a method of forming an orifice disc for a fuel injector, the orifice disc including a member having first and second generally parallel surfaces comprises forming an asymmetric orifice extending through the member between first and second generally planar surfaces of the member, the orifice being defined by a wall coupling the first and second surfaces, the wall including first and second wall portions and the orifice extending along an orifice axis generally perpendicular to the first and second generally parallel surfaces; and deforming the orifice proximate the first surface into a plurality of segmented surfaces of a second wall portion comprising curved surfaces extending helically from the first surface to the orifice, coupling the first wall portion to the first surface and each curved surface being separated from adjacent curved surfaces by a line; wherein the first wall portion defines a transition perimeter; and the second wall portion defines an elliptical inlet perimeter on the first surface.
  • the present invention also provides a method of forming an orifice disc for a fuel injector as defined in claim 9.
  • a fuel injector 100 extends along a longitudinal axis A-A, as illustrated in Figure 1A , and includes: a fuel inlet tube 110, an adjustment tube 112, a filter assembly 114, a coil assembly 118, a coil spring 116, an armature 120, a closure member assembly 122, a non-magnetic shell 124, a fuel injector overmold 135, a body 128, a body shell 130, a body shell overmold 132, a coil assembly housing 126, a guide member 136 for the closure member assembly 122, a seat 138, and an orifice disc 140.
  • the construction of fuel injector 100 can be of a type similar to those disclosed in commonly assigned U.S. Pat. Nos. 4,854,024 ; 5,174,505 ; and 6,520,421 .
  • Figure 1 B shows the outlet end of a body 128 of a solenoid operated fuel injector 100 having an orifice disc 140 embodying principles of the invention.
  • the outlet end of fuel injector 100 is also similar to those of the aforementioned patents including that of a stack.
  • the stack includes a guide member 136 and a seat 138, which are disposed axially interiorly of orifice disc 140.
  • the stack can be retained by a suitable technique such as, for example, a retaining lip with a retainer or by welding the disc 140 to the seat 138 and welding the seat 138 to the body 128.
  • Seat 138 can include a frustoconical seating surface 138a that leads from guide member 136 to a central passage 138b of the seat 138 that, in turn, leads to a central portion 140B of orifice disc 140.
  • Guide member 136 includes a central guide opening 136A for guiding the axial reciprocation of a sealing end 122a of a closure member assembly 122 and several through-openings 136B distributed around opening 136A to provide for fuel to flow through sealing end 122a to the space around seat 138.
  • Figure 1B shows the hemispherical sealing end 122a of closure member assembly 122 seated on seat 138, thus preventing fuel flow through the fuel injector.
  • the orifice disc 140 can have a generally circular shape with a circular outer peripheral portion 140A that circumferentially bounds the central portion 140B that is located axially in the fuel injector.
  • the central portion 140B of orifice disc 140 is imperforate except for the presence of one or more asymmetric orifices 32 via which fuel passes through orifice disc 140.
  • Any number of asymmetric orifices 32 can be configured in a suitable array about the longitudinal axis A-A so that the orifice disc 140 can be used for its intended purpose in metering, atomizing, and targeting fuel spray of a fuel injector.
  • the preferred embodiments include four such through-asymmetric orifices 32 (although only two are shown in the Figures) arranged about the longitudinal axis A-A through the orifice disc 140.
  • the preferred embodiments of the orifice disc 140 can be formed as follows. Initially, a generally planar blank work piece 10 having a first surface 20 spaced at a distance from a second surface 40 without any orifices extending therethrough is provided. The blank 10 is penetrated by a suitable technique such as, for example, punching, coining, drilling or laser machining to form a pilot through opening or pilot orifice 30 that is symmetrical about and extending along an axis Y-Y of the tool 25 generally perpendicular to the planar surfaces 20 and 40 of the blank.
  • a suitable technique such as, for example, punching, coining, drilling or laser machining to form a pilot through opening or pilot orifice 30 that is symmetrical about and extending along an axis Y-Y of the tool 25 generally perpendicular to the planar surfaces 20 and 40 of the blank.
  • the symmetrical pilot through-opening 30 is formed by a cylindrical punch 25 that forms a perpendicular burnished wall section 30A between surface 20 and proximate surface 40 with a rough chamfer 30B formed by a breakout (i.e., a fracturing) of material by the cylindrical punch 25 as the cylindrical punch 25 penetrates through to the second surface 40.
  • a breakout i.e., a fracturing
  • the symmetrical through opening or orifice 30 is further penetrated by a suitable technique to form an asymmetrical through-opening or orifice 32. Thereafter, the work piece can be processed into an orifice disc 140 by a suitable material finishing technique such as, for example, stamping, grinding, deburring, skiving, or polishing the work piece into a desired configuration.
  • a suitable material finishing technique such as, for example, stamping, grinding, deburring, skiving, or polishing the work piece into a desired configuration.
  • the asymmetric orifice 32 is formed by a punch tool 50 having a conic surface defining an apex 52 with at least two leading edges disposed about the tool axis Y-Y such that the resulting cross-section of the punch tool 50 is asymmetric about the orifice axis 200 ( Figs. 2C, 2D ).
  • the conic surface has leading edge 54 and leading edge 56.
  • the first leading edge 54 is oriented at a first lead angle ⁇ ° different from the second lead angle ⁇ ° of the second leading edge 56. In one of the preferred embodiments, the first lead angle ⁇ ° is approximately 25 degrees and the second lead angle ⁇ ° is approximately 30 degrees.
  • the lead angles for the conic surface about the tool axis Y-Y can be a range of angles in discrete steps between the first and second lead angles.
  • the lead angles for the conic surface about the tool axis Y-Y include continuously varying angles between the first and second lead angles.
  • the orifice 32 is shown after the punching of the tool 50 through the work piece along the orifice axis 200.
  • the orifice 32 has a wall coupling the first and second surfaces 20, 40 that includes a first wall portion 32A, second wall portion 32B, and third wall portion 32C.
  • the first wall portion 32A is spaced from the first surface 20 and extends substantially perpendicular to the first and second generally planar surfaces 20, 40 and about the orifice axis 200 to define a transition perimeter 42.
  • the second wall portion 32B couples the first wall portion 32A to the first surface 20 to define an elliptical inlet perimeter 44 on the first surface 20.
  • the working surface of the tool 50 can be provided with a plurality of raised helical surfaces 58A, 58B, 58C ... .
  • the helical surfaces 58A-58C form corresponding segmented surfaces 35A-35F that extend helically towards a transition perimeter 42 so that the segmented surfaces 35A-35F define an asymmetric orifice 32.
  • the segmented surfaces 35A-35F is defined by a plurality of helically arrayed lines 38A-38E and so on connecting the elliptical inlet perimeter 44 and the preferably cylindrical inlet transition section. Due to the convergent surface 35A-35F arrayed in such pattern about the orifice axis 200, fuel flowing through the orifice 32 tends to be induced with a rotation about the orifice axis 200.
  • the benefits of the asymmetrical geometry of the orifice 32 are believed to be many.
  • the orifice 32 can be formed by two tools moving in a direction perpendicular to the work piece to generate an orifice that emulates an angled orifice without requiring a tool to be oriented oblique to the perpendicular direction.
  • the asymmetrical geometry of the orifice 32 tends to angle the fuel flow 34 from and about the axis 200 to provide a spiraling fuel flow 36, which feature is believed to permit more of the fuel to be atomized.
  • the spiral segmented surfaces 35A-35F formed by the tool 50 are believed to induce the spiral fuel flow path 36 such that increased fuel atomization can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (13)

  1. Injecteur de carburant (100) pour mesurer, atomiser et pulvériser de manière ciblée du carburant, l'injecteur de carburant comprenant :
    un siège (138) comprenant un passage s'étendant le long d'un axe (A-A) longitudinal ;
    un élément (122) mobile coopérant avec le siège pour permettre à un courant de passer dans le passage et pour l'en empêcher ; et
    un disque (140) à orifice comprenant :
    un élément (10) comprenant des première (20) et deuxième (40) surfaces d'une manière générale parallèles, la première surface faisant d'une manière générale face au siège et la deuxième surface étant opposée à la première surface ; et
    un orifice (32) dissymétrique s'étendant dans l'élément (10) entre des première et deuxième surfaces généralement planes de l'élément le long d'un axe (200) de l'orifice et étant défini par une paroi couplant les première et deuxième surfaces, la paroi comprenant :
    une première partie (32A) de paroi à distance de la première surface, la première partie de paroi s'étendant sensiblement perpendiculairement à la première (20) et à la seconde (40) surfaces généralement planes et autour de l'axe longitudinal pour définir un périmètre (42) elliptique de transition ; et
    une deuxième partie (32B) de paroi couplant la première partie (32A) de paroi à la première surface (20) pour définir un périmètre (44) elliptique d'entrée sur la première surface (20), la deuxième partie de paroi comprenant :
    une pluralité de surfaces (35A à 35F) segmentées reliant le périmètre (44) elliptique d'entrée et le périmètre (42) de transition, chacune de la pluralité des surfaces segmentées comprenant des surfaces courbées s'étendant hélicoïdalement à partir de la première surface (20) et étant séparée de surfaces courbées voisines par une ligne (38A à 38E) reliant les périmètres d'entrée et de transition suivant une orientation hélicoïdale par rapport à l'axe (200) de l'orifice.
  2. Injecteur (100) de carburant suivant la revendication 1, dans lequel la seconde partie de paroi sur la première surface comprend une surface (34A à 35F) convergente s'étendant vers l'axe (A-A) longitudinal et autour de celui-ci, la surface convergente coupant le périmètre (42) de transition pour définir une ouverture à l'intersection entre la surface et la première partie (32A) de paroi.
  3. Injecteur de carburant suivant la revendication 2, dans lequel le périmètre (42) de transition se trouve dans un plan oblique par rapport à l'axe (200) de l'orifice.
  4. Injecteur de carburant suivant la revendication 3, dans lequel la paroi comprend une troisième partie (32C) couplant la première partie (32A) à la deuxième surface (40).
  5. Injecteur de carburant suivant la revendication 4, dans lequel la troisième partie (32C) de la paroi s'étend suivant un deuxième angle oblique par rapport à la deuxième surface (40) et, le deuxième angle oblique est, d'une manière générale, constant autour de l'axe (200) de l'orifice.
  6. Injecteur de carburant suivant la revendication 5, dans lequel la troisième partie (32C) de la paroi comprend une surface irrégulière.
  7. Injecteur de carburant suivant la revendication 6, comprenant en outre un périmètre extérieur défini par une jonction de la deuxième surface (40) et de la troisième partie (32C) de la paroi, le périmètre extérieur étant irrégulier et dissymétrique autour de l'axe (200) de l'orifice.
  8. Injecteur de carburant suivant la revendication 2, dans lequel le périmètre (42) de transition est un périmètre de transition cylindrique.
  9. Procédé de formation d'un disque (140) à orifice pour un injecteur (100) de carburant, le disque à orifice comprenant un élément (10) ayant une première (20) et une deuxième (40) surfaces généralement parallèles, le procédé comprenant :
    la formation d'un orifice (30) dissymétrique s'étendant à travers l'élément (40) entre des première (20) et deuxième (40) surfaces généralement planes de l'élément, l'orifice étant défini par une paroi couplant la première et la deuxième surfaces, la paroi comprenant des première et deuxième parties (32A, 32B) de parois et l'orifice s'étendant le long d'un axe (200) de l'orifice généralement perpendiculaire à la première et à la seconde surface généralement parallèles ; et
    la déformation de l'orifice à proximité de la première surface en une pluralité de surfaces segmentées d'une deuxième partie (32B) de paroi comprenant des surfaces (35A à 35F) courbées s'étendant hélicoïdalement de la première surface (20) à l'orifice (30, couplant la première partie (32A) de paroi à la première surface (20) et chaque surface courbée étant séparée de surfaces courbées voisines par une ligne (38A à 38E) ; la première partie (32A) de paroi définissant un périmètre (42) de transition ; et la deuxième partie (32B) de paroi définissant un périmètre (44) elliptique d'entrée sur la première surface.
  10. Procédé suivant la revendication 9, dans lequel le périmètre de transition est un périmètre de transition cylindrique.
  11. Procédé suivant la revendication 9 ou la revendication 10, dans lequel formé l'orifice (30) comprend au moins l'un d'un poinçonnage, perçage, enlèvement de copeaux et matriçage.
  12. Procédé suivant la revendication 9, dans lequel la déformation de l'orifice (30) comprend au moins l'un d'un formage par poinçonnage et d'un matriçage.
  13. Procédé suivant la revendication 9 ou la revendication 10, dans lequel la déformation comprend en outre le bossuage d'une région sur laquelle l'orifice (30) est disposé de façon à ce que la région forme une facette ayant un plan en oblique par rapport à l'axe de l'orifice.
EP05010013A 2004-05-19 2005-05-09 Injecteur de carburant avec un disque à orifices ainsi que la méthode de formation du disque à orifices Expired - Fee Related EP1600628B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/848,078 US7086615B2 (en) 2004-05-19 2004-05-19 Fuel injector including an orifice disc and a method of forming an oblique spiral fuel flow
US848078 2004-05-19

Publications (2)

Publication Number Publication Date
EP1600628A1 EP1600628A1 (fr) 2005-11-30
EP1600628B1 true EP1600628B1 (fr) 2009-10-14

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EP05010013A Expired - Fee Related EP1600628B1 (fr) 2004-05-19 2005-05-09 Injecteur de carburant avec un disque à orifices ainsi que la méthode de formation du disque à orifices

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US (1) US7086615B2 (fr)
EP (1) EP1600628B1 (fr)
DE (1) DE602005017092D1 (fr)

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US7086615B2 (en) 2006-08-08
US20050258277A1 (en) 2005-11-24
DE602005017092D1 (de) 2009-11-26
EP1600628A1 (fr) 2005-11-30

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